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INVESTMENTS - Summary of Investment Securities by Estimated Maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Held-to-Maturity Amortized Cost |  |
Amortized Cost | $ 83,070 | $ 84,021
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 75,762 | 76,485
Available-for-Sale Amortized Cost |  |
Debt Securities, Available-for-sale, Amortized Cost | 3,763,658 | 3,827,418
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 3,384,949 | 3,409,648
One Year or Less [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 0 |
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 0 |
Available-for-Sale Amortized Cost |  |
Debt Securities, Available-for-sale, Amortized Cost | 8,119 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 7,981 |
After One Year Through Five Years [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 2,607 |
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 2,720 |
Available-for-Sale Amortized Cost |  |
Debt Securities, Available-for-sale, Amortized Cost | 99,178 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 93,713 |
After Five Years Through Ten Years [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 34,951 |
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 32,381 |
Available-for-Sale Amortized Cost |  |
Debt Securities, Available-for-sale, Amortized Cost | 293,272 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 258,231 |
After Ten Years [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 1,823 |
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 1,637 |
Available-for-Sale Amortized Cost |  |
Debt Securities, Available-for-sale, Amortized Cost | 688,456 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 590,697 |
Residential Mortgage Backed Securities [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 0 | 0
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 0 | 0
Available-for-Sale Amortized Cost |  |
Debt Securities, Available-for-sale, Amortized Cost | 734,761 | 747,478
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 649,243 | 650,063
Commercial Mortgage Backed Securities [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 34,659 | 35,363
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 30,678 | 31,249
Available-for-Sale Amortized Cost |  |
Debt Securities, Available-for-sale, Amortized Cost | 669,015 | 676,934
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 624,894 | 629,562
Collateralized Mortgage Backed Securities [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 9,030 | 9,280
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 8,346 | 8,453
Available-for-Sale Amortized Cost |  |
Debt Securities, Available-for-sale, Amortized Cost | 524,394 | 538,970
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 465,115 | 477,712
Asset-backed Securities [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 0 | 0
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 0 | 0
Available-for-Sale Amortized Cost |  |
Debt Securities, Available-for-sale, Amortized Cost | 746,463 | 772,261
Available-for-Sale Market Value |  |
Investment securities available-for-sale | $ 695,075 | $ 711,325

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